package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 分类业务层
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
        @Autowired
        private ShoppingCartMapper shoppingCartMapper;
        @Autowired
        private DishMapper dishMapper;
        @Autowired
        private SetmealMapper setmealMapper;

        /**
         * 添加购物车
         * @param shoppingCartDTO
         */
        public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
            //只能查询自己的购物车数据
            shoppingCart.setUserId(BaseContext.getCurrentId());

            //判断当前商品是否在购物车中
            List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
            if (shoppingCartList != null && shoppingCartList.size() == 1) {
                //如果已经存在，就更新数量，数量加1
                shoppingCart = shoppingCartList.get(0);
                shoppingCart.setNumber(shoppingCart.getNumber() + 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            } else {
                //如果不存在，插入数据，数量就是1
                Long dishId = shoppingCartDTO.getDishId();
                if (dishId != null) {
                    //添加到购物车的是菜品
                    Dish dish = dishMapper.getById(dishId);
                    shoppingCart.setName(dish.getName());
                    shoppingCart.setImage(dish.getImage());
                    shoppingCart.setAmount(dish.getPrice());
                } else {
                    //添加到购物车的是套餐
                    Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                    shoppingCart.setName(setmeal.getName());
                    shoppingCart.setImage(setmeal.getImage());
                    shoppingCart.setAmount(setmeal.getPrice());
                }
                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());
                shoppingCartMapper.insert(shoppingCart);
            }
        }
    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }


}
